A layered columnar zinc-based metal-organic framework material and preparation method

Abstract

A layered columnar zinc-based metal-organic framework material and preparation method, wherein the chemical formula of the framework material is: {[(CH 3 ) 2 NH 2 ] 0.5 [Zn(CBA)(TZT) 0.5 0.5DMA]} n , there is a zinc ion with a coordination environment in its basic structural unit, a deprotonated ligand CBA 2‑ , 0.5 deprotonated ligand TZT ‑ and 0.5 free DMA molecules and 0.5 dimethylamine cations; the adjacent zinc ions pass through the dehydrogenation ligand CBA 2‑ A two-dimensional layered planar structure is formed in space; the two-dimensional layered planar structure is further passed through the dehydrogenation ligand TZT ‑ connected to form a three-dimensional layer-column network structure in space. The material prepared by the invention is simple in synthesis, low in cost and high in stability, and can detect the existence of Cr(VI) ions in water through fluorescence quenching effect, and is used for Cr(VI) ions in water. 2 O 7 2‑ The detection limit of ion detection is 252 µmol·L ‑1 and for CrO 4 2‑ The detection limit of ion detection is 56.7µmol·L ‑1 Therefore, it has great potential application value in the detection of Cr(VI) ions in water.

Description

technical field [0001] The invention relates to a preparation method of a zinc-based metal-organic framework material, and belongs to the technical field of porous molecular crystal materials. Background technique [0002] Chromate and dichromate ions are considered as one of many non-biodegradable environmental pollutants, but they are widely used in pigments, leather tanning, electroplating and other fields. These two ions can be enriched in living organisms, causing various health problems. Excessive absorption of chromate ions and dichromate ions can cause lesions in the organs of the organism leading to cancer, deformities and genetic mutations. The United States Environmental Protection Agency clearly stipulates that the concentration of chromate ions and dichromate ions in drinking water should not exceed 100ppb. Therefore, it is necessary to develop and develop methods that can efficiently and rapidly detect chromate ions and dichromate ions in water. [0003] Som...

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Problems solved by technology

[0003] Some technologies that have been developed at present, such as atomic absorption method, liquid chromatography, inductively coupled plasma, spectroscopic analysis method, electrochemical method, etc., can effectively detect chromate ion and dichromate ion, but these technologies are ubiquitous. Problems such as time-consuming, high cost, complicated pre-processing and the need for professionals seriously restrict their application

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